Common equipment includes:

Portable Purification Units: For on-site oil treatment during maintenance.
Stationary Purification Systems: Installed at substations or maintenance facilities.
Vacuum Dehydrators: Specialize in removing moisture and gases.
Centrifugal Separators: Use centrifugal force to separate contaminants based on density.
Fuller’s Earth Systems: Utilize adsorption media to remove acids and oxidation products.
Selection depends on the specific needs of the cable system and the type of contaminants present.